Middleman can be as simple or advance as needed since developers can utilize one or more of all the technologies that it supports. It extremely simplifies the process of testing some of these technologies since it installs all of its tools and compilers at once.

HTML Support
Perfect for getting into templating languages without a full Rails app to support it (ERB, Haml,…). It also incorporates an HTML5 boilerplate to get started.

CSS Support
Auto-generates your CSS from SASS or SCSS files and supports Compass.